Fuse Arrangements
In most modules there are two fuses inside each module on the supply side of the transformer. For
single modules they are ALWAYS 250 mA Anti-Surge type. The fuse value does NOT change
when the mains voltage selector switch is changed. This is because we fuse each winding
separately.
We strongly recommend that you do NOT attempt to change fuses unless you are absolutely
certain that you know exactly what you are doing. If you are in any doubt whatsoever please
contact your dealer or the factory before you open the case.
Changing a Fuse
If it is a Blue module and you are certain about your technical ability, this is the procedure for
changing a fuse:
•
disconnect the mains cable
•
remove the top or side cover and have a careful look about the inside of the module to see of
the cause for the fuse failure is obvious.
•
if all looks well replace the covers
•
change the fuses
the fuses are either on the rear panel adjacent to the IEC mains inlet connector or
inside the module to the rear of the transformer.
Signal Connections
All the signal connections are via rear panel mounted connectors. Standard XLR connectors are
used for all signals and for all AES / EBU digital signals. These are always wired to the AES
standards which are:
pin 1
X
Screen
screen
screen
pin 2
L
Live
audio 0°
or
digital 0°
pin 3
R
Return
audio 180°
digital 180°
Almost all main audio inputs, all line level outputs and all AES / EBU ports are transformer
coupled, therefore there is a complete electrical barrier between all the internal circuitry and power
supply and the outside world - this barrier is also maintained for the Screen connections. The only
transformerless inputs are on the mastering dynamics modules : Blue 315MKII , Blue 330MKII .
All optical digital signals are to the TosLink standard and all digital synchronising signals are
provided as AES / EBU standard sync ports and often duplicated with Word Clock via BNC
connectors, which are all floating from the chassis.